This is a cross of the genes Aa, which were produced by Iromi and Shiwao.
From this combination, the genetic type of child appears AA, Aa and aa in ratio of 1 to 2 to 1. A gene A is dominant to a gene a, so shape of a pea with gene AA and a pea with gene Aa is round, and a pea with gene aa is wrinkled.
And the ratio of round-shaped peas to wrinkled peas is 3 to 1.
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